A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-01-553-7917
NSN 5855-01-542-9059
NSN 6145-01-560-3518
NSN 5999-01-533-7393
NSN 6135-01-071-4923
NSN 5960-01-461-1384
NSN 6220-00-588-6093
NSN 5905-00-056-5762
NSN 5930-01-263-5124
NSN 6220-01-176-1863
NSN 6145-01-474-9228
NSN 5990-00-090-3829